Polyazo dyes having a diazo component of the aminobenzophenone series

ABSTRACT

0 to 1 are useful in free form or as copper, chromium, iron, cobalt or nickel complexes for dyeing leather.

This application is a continuation of application Ser. No. 07/988,756, filed on Dec. 10, 1992, now abandoned.

The present invention concerns novel polyazo dyes of the formula I ##STR2## where p is from 1 to 2,

q is from 0 to 1,

X¹ is hydrogen or hydroxysulfonyl,

X² is hydrogen, hydroxysulfonyl, hydroxysulfonylphenyl, hydroxysulfonylbenzyl or hydroxysulfonylphenylethyl,

R¹, R² and R³ are identical or different and each is independently of the others hydrogen, halogen, C₁ -C₁₂ -alkyl, cyclohexyl or C₁ -C₄ -alkoxy,

R⁴ is hydrogen, C₁ -C₄ -alkyl, C₁ -C₄ -alkoxy or chlorine,

R⁵ and R⁶ are identical or different and each is independently of the other hydroxyl or amino,

R⁷ is hydrogen, C₁ -C₄ -alkyl, halogen, nitro, hydroxysulfonyl, sulfamoyl, C₁ -C₄ -mono- or -dialkylsulfamoyl, phenylsulfamoyl or C₁ -C₄ -alkylsulfonyl,

R⁸ is hydrogen, halogen, nitro or hydroxysulfonyl, and

Y is a radical of the formula ##STR3## where R⁹ is hydrogen, hydroxyl, halogen, nitro or hydroxysulfonyl,

R¹⁰ is hydrogen, halogen, nitro or hydroxysulfonyl, and

R¹¹ is hydrogen, C₁ -C₄ -alkyl, C₁ -C₄ -alkoxy or hydroxysulfonyl,

the ring A is optionally benzofused and a benzofused ring A can be bridged by C₂ H₄ and the rings B and C can each be fused by an optionally nitro- or hydroxysulfonyl-substituted benzo ring, in free form or as copper, chromium, iron, cobalt or nickel complex, and the use of the novel dyes for dyeing leather.

CH-A-571 599, DE-A-2 024 047, DE-A-2 162 419 and EP-A-45 868 describe polyazo dyes which are similar to those of the formula I. However, instead of the carbonyl group these dyes contain an imino group. EP-A-355 601 also discloses similar polyazo dyes which instead of the carbonyl group have a sulfur-containing bridge member.

It is an object of the present invention to provide novel polyazo dyes which shall be easily obtainable and have advantageous application properties.

We have found that this object is achieved by the dyes of the abovementioned formula I.

Any alkyl appearing in the compounds of the invention can be either straight-chain or branched.

R¹, R², R³, R⁴ and R¹¹ are each for example methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy or sec-butoxy.

R¹, R², R³, R⁴ and R¹¹ may each also be for example, as is R⁷, methyl, ethyl, propyl, isopropyl, butyl, isobutyl or sec-butyl.

R¹, R², R³ and R⁷ may each also be for example, as is each of R⁸, R⁹ and R¹⁰, fluorine, chlorine or bromine. Of these, chlorine or bromine is preferred.

R¹, R² and R³ may each also be for example pentyl, isopentyl, neopentyl, tert-pentyl, hexyl, 2-methylpentyl, heptyl, 2-methylhexyl, octyl, isooctyl, 2-ethylhexyl, nonyl, isononyl, decyl, isodecyl, undecyl or dodecyl (the above designations isooctyl, isononyl and isodecyl are trivial names derived from the oxo process alcohols - cf. Ullmanns Encyklopadie der technischen Chemie, 4th edition, volume 7, pages 215 to 217, and also volume 11, pages 435 and 436).

R⁷ may also be for example mono- or dimethylsulfamoyl, mono- or diethylsulfamoyl, mono- or dipropylsulfamoyl, mono- or diisopropylsulfamoyl, mono- or dibutylsulfamoyl, N-methyl-N-ethylsulfamoyl, methylsulfonyl, ethylsulfonyl, propylsulfonyl, isopropylsulfonyl or butylsulfonyl.

The indices p and q may each also be fractions of integers, in which case mixtures of polyazodyes are present.

It will be readily understood that, if the polyazo dyes of the formula I contain one or more hydroxysulfonyl groups, the salts thereof are also to be encompassed by the invention.

The salts envisioned here are metal or ammonium salts. Metal salts are in particular the lithium, sodium or potassium salts. Ammonium salts for the purposes of the present invention are those salts which have either substituted or unsubstituted ammonium cations. Substituted ammonium cations are for example monoalkyl-, dialkyl-, trialkyl-, tetraalkyl- or benzyltrialkylammonium cations or those cations which are derived from nitrogen-containing 5- or 6-membered saturated heterocycles, such as pyrrolidinium, piperidinium, morpholinium, piperazinium or N-alkylpiperazinium cations or their N-monoalkyl- or N,N-dialkyl-substituted products. Alkyl as used herein is to be understood as meaning in general straight-chain or branched C₁ -C₂₀ -alkyl, which can be substituted by hydroxyl groups and/or interrupted by from 1 to 4 oxygen atoms in either function.

Preference is given to polyazo dyes of the formula I where

q is 0,

X¹ is hydrogen or hydroxysulfonyl,

X² is hydrogen or hydroxysulfonyl,

R¹, R² and R³ are each independently of the others hydrogen, halogen, C₁ -C₆ -alkyl, cyclohexyl or C₁ -C₄ -alkoxy,

R⁴ is hydrogen, and

the ring A is not benzofused.

Preference is further given to polyazo dyes of the formula I in which one of the two radicals X¹ and X² is hydrogen and the other is hydroxysulfonyl.

Of importance are aminobenzophenones of the formula I where R¹, R² and R³ are each independently of the others hydrogen, chlorine, C₁ -C₄ -alkyl, especially methyl or ethyl, methoxy or ethoxy.

Of particular importance are polyazo dyes of the formula Ia ##STR4## where Z is a radical of the formula IIa ##STR5## where one of the radicals X¹ and X² is hydrogen and the other is hydroxysulfonyl and R¹ is chlorine, C₁ -C₄ -alkyl.sub., in particular methyl or ethyl, methoxy or ethoxy and where the carbonyl group is para to X¹ or to the azo group.

Of particular importance are also polyazo dyes of the formula Ia where Z is a radical of the formula IIb or IIc ##STR6## where one of the radicals X¹ and X² is hydrogen and the other is hydroxysulfonyl and R¹ and R² are each independently of the other chlorine, C₁ -C₄ -alkyl, in particular methyl or ethyl, methoxy or ethoxy and where the carbonyl group is in each case para to X¹ or to the azo group.

Also of commercial interest are the copper, chromium, iron or cobalt complexes of the polyazo dyes of the formula I, in particular the iron or chromium complexes.

The polyazo dyes of the invention are obtainable by methods known per se.

One possible method is to diazotize an aminophenol of the formula III ##STR7## where R⁷, R⁸ and the ring B are each as defined above, and couple the diazonium salt with a coupling component of the formula IV ##STR8## where R⁵ and R⁶ are each as defined above, to form a monoazo compound of the formula V ##STR9## where R⁵, R⁶, R⁷, R⁸ and the ring B are each as defined above.

This may be followed by diazotizing an amino-benzophenone of the formula II ##STR10## where R¹, R², R³, R⁴, X¹, X² and the ring A are each as defined above, and coupling the diazonium salt with the above-described monoazo compound V.

If desired, it is then possible to diazotize an amine of the formula VI

    Y--NH.sub.2                                                (VI)

where Y is as defined above, and couple the diazonium salt with the disazo dye of the formula I (where q=0).

This example of a possible method of preparation is not of course obligatory; that is, it is also possible to vary the order in which the coupling reactions are carried out. For example, the aminobenzophenone II may be diazotized first and coupled with the coupling component IV and the resulting reaction product then coupled with the aminophenol III, previously diazotized.

The metallization, i.e. the preparation of the respective copper, chromium, iron, cobalt or nickel complexes, of the polyazo dyes I is likewise effected by methods known per se. For example, by treatment of the polyazo dye with the corresponding metal salts, for example with iron(III) chloride, iron(II) sulfate, copper sulfate or chromium(III) formate, in aqueous solution at from 80° to 105° C. and at pH 4-6.

The aminophenols III and the coupling component IV are compounds known per se. The aminobenzophenones are described in the earlier Patent Application EP-A-469,399.

There follow some examples of aminobenzophenones of the formula II and suitable aminophenol derivatives of the formula III.

Aminobenzophenones of the formula II are for example ##STR11##

Aminophenols of the formula III are for example ##STR12##

The polyazo dyes of the invention are advantageous for dyeing leather.

The invention will now be more particularly described by means of examples. The percentages mentioned are by weight.

EXAMPLE 1

19.9 g of 1-amino-2-hydroxy-3,5-dinitrobenzene were conventionally diazotized and coupled under alkaline conditions with 11 g of resorcinol. Then the diazonium salt of 29.1 g of 4-amino-4'-methylbenzophenone-3'-sulfonic acid was added to the suspension at pH 8-9. After the coupling had ended, the reaction mixture was adjusted to pH 5 with acetic acid, admixed with 38 g of anhydrous iron(III) chloride and heated at pH 4-5 to 90°-95° C. for about 3 hours.

The metallization was followed by the addition of sodium chloride to precipitate the dye, which was then isolated and dried. The iron complex of the compound of the formula ##STR13## dyes leather in light- and wet-fast yellowish brown shades.

The dyes listed below in the tables are obtained in a similar manner.

                                      TABLE 1                                      __________________________________________________________________________      ##STR14##                                                                                                               Hue of dyeing of metal                                                         complexes on leather                 Ex. No.                                                                              A           R                       Cu  Cr  Co  Ni  Fe                   __________________________________________________________________________      2                                                                                    ##STR15##                                                                                  ##STR16##                                                                                              ##STR17##                                                                                  ##STR18##                3                                                                                    ##STR19##                                                                                  ##STR20##                                                                                                  ##STR21##                                                                                  ##STR22##            4                                                                                    ##STR23##                                                                                  ##STR24##              brown                                                                                       ##STR25##                                                                          ##STR26##            5                                                                                    ##STR27##                                                                                  ##STR28##                                                                                              ##STR29##                                                                             brown                                                                                   ##STR30##            6                                                                                    ##STR31##                                                                                  ##STR32##                  brown                                                                                       ##STR33##            7                                                                                    ##STR34##                                                                                  ##STR35##                                                                                                      ##STR36##                                                                              ##STR37##            8                                                                                    ##STR38##                                                                                  ##STR39##                                                                                                  ##STR40##                                                                                  ##STR41##            9                                                                                    ##STR42##                                                                                  ##STR43##                                                                                                  ##STR44##                                                                              ##STR45##               10                                                                                    ##STR46##                                                                                  ##STR47##                                                                                              ##STR48##                                                                                      ##STR49##           11                                                                                    ##STR50##                                                                                  ##STR51##                  brown   brown                                                                               ##STR52##           12                                                                                    ##STR53##                                                                                  ##STR54##                                                                                                      ##STR55##                                                                              ##STR56##           13                                                                                    ##STR57##                                                                                  ##STR58##                  brown                                                                                       ##STR59##           14                                                                                    ##STR60##                                                                                  ##STR61##                                                                                              ##STR62##                                                                              ##STR63##                                                                              ##STR64##           15                                                                                    ##STR65##                                                                                  ##STR66##                                                                                                  ##STR67##                                                                          ##STR68##                                                                              ##STR69##           16                                                                                    ##STR70##                                                                                  ##STR71##                                                                                              ##STR72##                                                                          ##STR73##                                                                                  ##STR74##           17                                                                                    ##STR75##                                                                                  ##STR76##                                                                                              ##STR77##                                                                                      ##STR78##           18                                                                                    ##STR79##                                                                                  ##STR80##                                                                                                  ##STR81##                                                                                  ##STR82##           19                                                                                    ##STR83##                                                                                  ##STR84##                                                                                                          ##STR85##               20                                                                                    ##STR86##                                                                                  ##STR87##                                                                                              ##STR88##  brown                    21                                                                                    ##STR89##                                                                                  ##STR90##                                                                                                  ##STR91##  brown                22                                                                                    ##STR92##                                                                                  ##STR93##                                                                                                      ##STR94##                                                                             brown                23                                                                                    ##STR95##                                                                                  ##STR96##                                                                                              ##STR97##                                                                                      ##STR98##           24                                                                                    ##STR99##                                                                                  ##STR100##                                                                                                 ##STR101##                                                                                 ##STR102##          25                                                                                    ##STR103##                                                                                 ##STR104##                                                                                             ##STR105##                                                                                 ##STR106##              26                                                                                    ##STR107##                                                                                 ##STR108##                                                                                             ##STR109##                                                                                     ##STR110##          27                                                                                    ##STR111##                                                                                 ##STR112##                                                                                                 ##STR113##                                                                                 ##STR114##          28                                                                                    ##STR115##                                                                                 ##STR116##                                                                                                     ##STR117##                                                                             ##STR118##          __________________________________________________________________________

                                      TABLE 2                                      __________________________________________________________________________                                               Hue of dyeing of metal                                                         complexes on leather                 Ex. No.                                                                              A           R                       Cu  Cr  Co  Ni  Fe                   __________________________________________________________________________     29                                                                                    ##STR119##                                                                                 ##STR120##                                                                                             ##STR121##                                                                                     ##STR122##          30                                                                                    ##STR123##                                                                                 ##STR124##                                                                                                 ##STR125##                                                                                 ##STR126##          31                                                                                    ##STR127##                                                                                 ##STR128##                                                                                                 ##STR129##                                                                             ##STR130##              32                                                                                    ##STR131##                                                                                 ##STR132##                                                                                             ##STR133##                                                                             ##STR134##                                                                            brown                33                                                                                    ##STR135##                                                                                 ##STR136##                                                                                                 ##STR137##                                                                                 ##STR138##          34                                                                                    ##STR139##                                                                                 ##STR140##                                                                                                 ##STR141## brown                35                                                                                    ##STR142##                                                                                 ##STR143##                                                                                             ##STR144##                                                                             ##STR145##                  36                                                                                    ##STR146##                                                                                 ##STR147##                                                                                                 ##STR148## brown                37                                                                                    ##STR149##                                                                                 ##STR150##                                                                                             ##STR151##                                                                                     ##STR152##          38                                                                                    ##STR153##                                                                                 ##STR154##                                                                                                 ##STR155##                                                                                 ##STR156##          39                                                                                    ##STR157##                                                                                 ##STR158##                                                                                             ##STR159##                                                                                 ##STR160##              40                                                                                    ##STR161##                                                                                 ##STR162##                                                                                             ##STR163##                                                                                     ##STR164##          41                                                                                    ##STR165##                                                                                 ##STR166##                                                                                                 ##STR167##                                                                                 ##STR168##          42                                                                                    ##STR169##                                                                                 ##STR170##                                                                                                     ##STR171##                                                                             ##STR172##          __________________________________________________________________________

                                      TABLE 3                                      __________________________________________________________________________      ##STR173##                                                                                                         Hue of dyeing of metal complexes on                                            leather                                   Ex. No.                                                                             A         R                     Cu   Cr   Co   Ni   Fe                    __________________________________________________________________________     43                                                                                   ##STR174##                                                                               ##STR175##                                                                                           ##STR176##                                                                                         ##STR177##           44                                                                                   ##STR178##                                                                               ##STR179##                                                                                                ##STR180##    brown                 45                                                                                   ##STR181##                                                                               ##STR182##                                                                                                          ##STR183##                46                                                                                   ##STR184##                                                                               ##STR185##                                                                                           ##STR186##                               47                                                                                   ##STR187##                                                                               ##STR188##                brown                                                                                          ##STR189##           48                                                                                   ##STR190##                                                                               ##STR191##                                                                                                     ##STR192##                                                                               ##STR193##           49                                                                                   ##STR194##                                                                               ##STR195##                                                                                           ##STR196##                                                                                    ##STR197##                50                                                                                   ##STR198##                                                                               ##STR199##                                                                                                ##STR200##                                                                                    ##STR201##           51                                                                                   ##STR202##                                                                               ##STR203##                                                                                           ##STR204##                                                                          ##STR205##                                                                                    ##STR206##           52                                                                                   ##STR207##                                                                               ##STR208##                                                                                                ##STR209##                                                                                    ##STR210##           53                                                                                   ##STR211##                                                                               ##STR212##                                                                                           ##STR213##                                                                                    ##STR214##                                                                          ##STR215##           54                                                                                   ##STR216##                                                                               ##STR217##                                                                                           ##STR218##                                                                                         ##STR219##           55                                                                                   ##STR220##                                                                               ##STR221##                                                                                                ##STR222##                                                                                    ##STR223##           56                                                                                   ##STR224##                                                                               ##STR225##                                                                                                     ##STR226##                                                                              brown                 57                                                                                   ##STR227##                                                                               ##STR228##                               brown                 __________________________________________________________________________

EXAMPLE 58

19.9 g of 1 -amino-2-hydroxy-3,5-dinitrobenzene were conventionally diazotized and coupled under alkaline conditions with 11 g of resorcinol. Then the diazonium salt of 29.1 g of 4-amino-4'-methylbenzophenone-3'-sulfonic acid was added to the suspension at pH 8-9. After the formation of the disazo dye was complete, the diazo compound of 21.8 g of 1-amino-4-nitrobenzene-2-sulfonic acid was added in such a way that coupling took place at a pH between 6 and 7. After the coupling reaction had ended, the reaction mixture was adjusted to pH 5 with acetic acid and complexed with anhydrous iron(III) chloride as described in Example 1.

The metallization was followed by the addition of sodium chloride to precipitate the dye, which was then isolated and dried. The iron complex of the compound of the formula ##STR229## dyes vegetable/synthetically retanned chrome cattlehide leather in light- and wet-fast brown shades.

The dyes listed below in the table are obtained in a similar manner.

                                      TABLE 4                                      __________________________________________________________________________      ##STR230##                                                                                                           Hue of Fe                               Ex. No.                                                                              R                    X           complex on leather                      __________________________________________________________________________     59                                                                                    ##STR231##                                                                                          ##STR232## yellowish brown                         60                                                                                    ##STR233##                                                                                          ##STR234## brown                                   61                                                                                    ##STR235##                                                                                          ##STR236## yellowish brown                         62                                                                                    ##STR237##                                                                                          ##STR238## brown                                   63                                                                                    ##STR239##                                                                                          ##STR240## reddish brown                           64                                                                                    ##STR241##                                                                                          ##STR242## brown                                   65                                                                                    ##STR243##                                                                                          ##STR244## brown                                   66                                                                                    ##STR245##                                                                                          ##STR246## brown                                   67                                                                                    ##STR247##                                                                                          ##STR248## brown                                   __________________________________________________________________________ 

We claim:
 1. A polyazo dye of the formula (Ia) ##STR249## where p is from 1 to 2, R⁵ and R⁶, identical or different, are hydroxyl or amino;R⁷ is hydrogen, C₁₋₄ alkyl, halogen, nitro, hydroxsulfonyl, sulfamoyl, C₁₋₄ mono- or -dialkylsulfamoyl, phenylsulfamoyl or C₁₋₄ -alkylsulfonyl; R⁸ is hydrogen, halogen, nitro or hydroxysulfonyl; the ring B can be fused by an optionally nitro- or hydroxysulfonyl-substituted benzo ring, in free form or as a copper, chromium, iron, cobalt or nickel complex; and Z is a radical of the formula (IIa) ##STR250## where one of the radicals X¹ and X² is hydrogen and the other is hydroxysulfonyl; R¹ is chlorine or C₁₋₄ -alkyl; and the carbonyl group of the radical (IIa) is para to X¹ or to the azo group.
 2. A polyazo dye of the formula (Ia) ##STR251## where p is from 1 to 2, R⁵ and R⁶, identical or different, are hydroxyl or amino;R⁷ is hydrogen, C₁₋₄ alkyl, halogen, nitro, hydroxysulfonyl, sulfamoyl, C₁₋₄ -mono- or -dialkylsulfamoyl, phenylsulfamoyl or C₁₋₄ -alkylsulfonyl; R⁸ hydrogen, halogen, nitro or hydroxysulfonyl; the ring B can be fused by an optionally nitro- or hydroxysulfonyl-substituted benzo ring, in free form or as a copper, chromium, iron, cobalt or nickel complex; and Z is a radical of the formula (IIb) ##STR252## where one of the radicals X¹ and X² is hydrogen and the other is hydroxysulfonyl; R¹ and R², the same or different, are chlorine or C₁₋₄ -alkyl; and the carbonyl group of the radical (IIb) is para to X¹ or to the azo group.
 3. A polyazo dye of the formula (Ia) ##STR253## where p is from I to 2, R⁵ and R⁶, identical or different, are hydroxyl or amino;R⁷ is hydrogen, C₁₋₄ alkyl, halogen, nitro, hydroxysulfonyl, sulfamoyl, C₁₋₄ -mono- or -dialkylsulfamoyl, phenylsulfamoyl or C₁₋₄ -alkylsulfonyl; R⁸ is hydrogen, halogen, nitro or hydroxysulfonyl; the ring B can be fused by an optionally nitro- or hydroxysulfonyl-substituted benzo ring, in free form or as copper, chromium, iron, cobalt or nickel complex; and Z is a radical of the formula (IIc) ##STR254## where one of the radicals X¹ and X² is hydrogen and the other is hydroxysulfonyl; R¹ and R², the same or different, are chlorine or C₁₋₄ -alkyl; and the carbonyl group of the radical (IIc) is para to X¹ or to the azo group.
 4. A method of dyeing leather comprising applying thereto a polyazo dye of claim
 1. 